01: /*
02: * <copyright>
03: *
04: * Copyright 1997-2004 BBNT Solutions, LLC
05: * under sponsorship of the Defense Advanced Research Projects
06: * Agency (DARPA).
07: *
08: * You can redistribute this software and/or modify it under the
09: * terms of the Cougaar Open Source License as published on the
10: * Cougaar Open Source Website (www.cougaar.org).
11: *
12: * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
13: * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
14: * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
15: * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
16: * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
17: * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
18: * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
19: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
20: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
21: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
22: * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
23: *
24: * </copyright>
25: */
26:
27: package org.cougaar.util;
28:
29: import java.util.ArrayList;
30: import java.util.Collection;
31:
32: /**
33: * A Thunk is small piece of code to be executed repeatedly, often
34: * gathering state for later perusal.
35: */
36:
37: public interface Thunk {
38: /** Called to "run" the thunk on an object **/
39: void apply(Object o);
40:
41: /** A counter thunk which counts the number of times it is called.
42: * May be reused via reset() method, but no attempt is made to
43: * make instances thread-safe.
44: **/
45: class Counter implements Thunk {
46: private int counter = 0;
47:
48: public Counter() {
49: }
50:
51: public void apply(Object o) {
52: counter++;
53: }
54:
55: public int getCount() {
56: return counter;
57: }
58:
59: public void reset() {
60: counter = 0;
61: }
62: }
63:
64: /** a Thunk which collects all the arguments into a Collection **/
65: class Collector implements Thunk {
66: private final Collection c;
67:
68: public Collector() {
69: c = new ArrayList();
70: }
71:
72: public Collector(Collection c) {
73: this .c = c;
74: }
75:
76: public void apply(Object o) {
77: c.add(o);
78: }
79:
80: public Collection getCollection() {
81: return c;
82: }
83: }
84:
85: }
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